Power electric shears or scissors



zwi. 192s.

J. L. STUMP ET AL POWER ELECTRIC SHEARS 0R SCISSORS F1106 March, 24.1924 Patented Aug.. 25, 1925.

UNITED STATES i iss-ine PATENT OFFICE; f

JOHN LOUIS STUD/IIE' .AND CHARLES W. STUMP, JR., 0F CUMBERLAND,MARYLAND.

POWER ELECTRIC OR SCISSORS.

Application filed March 24, 1924. Serial No. 701,523.

10 in to the accompanying drawings.

This invention relates to a power electric shears or scissors, andthe.object of the invention is the construction of a simpleand eflicientshears that comprises a minimum number of parts, and which is veryefficient in operation.

With this and other' objects in view, our invention comprises certainnovel combinan tions, constructions and. arrangements of parts as `willbe'hereinafter described, illustrated in the accompanying drawings, andmore particularly pointed outv in the appended claims.

In. the drawings:

Figure 1 is a top plan view of a mechanism showing the top or cover ofthe housing or casing removed.

Figure 2 is av sectional View, taken on line 2--2, Fig. 1, and lookingin the direction 30 of the arrows, the cover beingshown on the casing.

Figure 3 is a perspective view of the sliding block and the inner end ofthe driven shaft.

Referring to the drawings by numerals, 1 comprises the housing or casingand 2 is the top or cover thereof. In the forward end of the casing 1 isplaced block 3, and in the casing, near the rear end, is block 4; theblock 4 extends transversely of the casing and supports parts of thedriving shaft 5 and the driven shaft 6.

The driven shaft 6' comprises an inner and 'an outer section which areconnected by the universal joint 7, producing practi* cally a flexibleshaft for driving the shear blades 8 and 9.

The lower blade 8 is fiXedly fastened (by screws, Fig. 2) to the top ofthe forward block 3, and the upper or pivotally mounted blade 9 issecured upon the fixed blade 8,

at 10, so that the upper blade 9 can swing or pivot to accomplish thecutting action.

We employ a sliding block 11 (Figs. 2 @5 and 3), which is placed .uponthe forward block 3, 'and the forwardly-extending extension 12, ofbloclr11, extends into a groove 13 in block 3. in the bottom of block 111s formed a groove 14, into which extends the long rib 15, which servesto hold the block 11 in an assembled position upon block 3. The block 11is provided on `its outer or rear face with a plurality of stud pins 16,on which stud pins are mounted tapering or ,conical-shaped rollers 17.Formed in the outer face of bloclrll, just around the stud pinsl6, is ahorizontal groove 18, into which extends the inner end 19 of the innersection of the driven shaft 6. On thisend 19 is placed aV roller 20,which roller is in the groove 18, (Figs. 2 and 3). Formed on the innersection of shaft 6, against block 11 is a. pinion 21 which in thisinstance is preferably provided with three `teeth that engage landtravel over the rollers 17 on the stud pins 16. Y By reason of thepinion 21 traveling over the rollers 17, the inner sect-ion of shaft 6will have to raise and fall, causing the reciprocal `movement of thesliding block 11. A screw 2 2 extends through slot 23 in blade'9,andpositioned on screw 22 is roller 24. Bychanging the position of screw 22upon bloc/lr 11 the stroke of the blade 9 will be controlled; ywhen thescrew 22 is in the position shownwin Fig. 2, it will have a longerswing, or opening` capacity than if the screw were placed in threadedsocket 22a nearer to the outer or rear face of the block; the changingof the position of screw v22 will be permitted owing to the length ofthe slot 23 (Fig. 2).

W e provide'af pair of angle brackets 25 for guiding the bearing block26 in its vertical movement; the block 26 .is mounted upon the `innersection of shaft 6, and the block is provided with the forced plug 27which -is for the `purpose of forcing a lubricant, in

the block, against the shaft 6. Each bracket 25 comprises a horizontalbase 28, through 100 which extends screws 29 for fastening the bracketsto the bottom of the casing 1. Integral with each base 28 is a curvedupright portion 3() that is provided with a groove or guideway 31 uponits inner face, into 105 which extends the vertical sliding bearingblock 26. The upper end of each eXtension 30 terminates in a flange 32(Fig. 2) into which extends the fastening screw 33. It will, therefore,be Yseen that by means, 0f no screws 29 and 33 the angle brackets 25will be securely fastened to the casing, with the bearing Yblock 26working therebetween.

The driving shaft 5 is provided on its extreme inner end with theVlocking collar 34, and intermediate its ends with a gear 35. Gear 35meshes with the large gear 36, which gear 36 is idle upon the outersection of the driven shaft (i. A friction clutch 37 is suitably keyedupon shaft 6, preferably by reason of the shaft being flattened where itis engaged by clutch 37. The. clutch 37 is pressed inwardly by coilspring 38, which spring 38 is held in place by a set collar 39.Operating lever AO is pivotally mounted, at 4l, and is provided with anintegral collar 42 that surrounds a portion of the clutch 3T, whereby,when the operator operates the outwardly-extending portion f3 of thelever, the clutchA 37 can be moved away from the gear 36 to stop the`mechanism from operating while power is being supplied to the drivingshaft 5 for rotating the same. Then nzo manual pressure is being exertedupon `lever Ll() then spring 38 causes the clutch 37 to normally engage,in frictional contact, the gea-r 36 suficient to impart rotary movementto the driven shaft while the driving shaft .is rotating, and `hence inthis manner the shear blade 9 is operated.

A felt washer All (Fig. 2) is placed between block 3, block 1l, the rearend of blade 8 and blade 9 to prevent any grease or lubricant movingforward to the cutting edges of the blades 8 and 9. y

While we have described the preferred embodiment of our invention, andhavel illustrated the same in the accompanying drawings,.certain minorchanges or valterations may appear to one skilled in the art to whichthis invention relates, during the extensive manufacture of the same andwe, therefore, reserve the right to make such altera-tions or changes asshall fairly fall within the scope ofthe appended claims.

l/Vhat we claim is:

1. A power clipperVV comprising'V a casing, a stationary block in theforward end portion of said casing havingl its rear end portion shapedto provide a seat undercut at itsV forward edge, an upstanding ribextending transversely across the seat and intermediate its forward andrear edges, a stationary blade secuied to said. block and Y extendingthrough a slot in the forward end of the casing above the block, amovable block resting in said seat and having a, lip extending into theundercut forward 'portion of the seat, a groove being provided in thelower face of the movable block and containing said rib to guide thesliding movement of he movable block transversely of the stationaryblock, a movable blade pivoted upon the stationary blade and having itsrear end portion extending 'over the movable block and having aLlongitudinally extending slot, a pin carried Aby said movableblock andextending through said slot fori imparting swinging movement to themovable blade when they movable block is moved in itsl seat, and meansfor impart'- ing sliding movement to the' movable block transversely ofthe stationary block.

2. A power clipper comprising a casing, a stationary block inthe forwardendv portion of said'casing, a stationary blade carried by said. block,a movable blade pivotally mounted upon said stationary blade, a movableblock slidably carried by said stationary block for movementtransversely thereof and having an operative connection with said'movable blade, said movable block having a pocket in its rear face andpinsl in the pocket in space-d relation to each other longitudinally ofthel pocket and extending out of the pocket, a drivingv Shaft extendinginto the casing through theV rear end thereof, a driven shaft in saideasing having its forward end extending into the pocket, a gear carriedby said driven shaft andl engaging the outwardly protruding portions ofthe pinsfor imparting sliding'movement JOHN Louis srUMr. CHARLES w.sTUMnJR.

